Gcse biology b - Study guides, Class notes & Summaries

Actual 2024 OCR GCSE Biology B Twenty First Century Science J257/04: Depth in Biology (HigherTier) Merged Question Paper + Mark Scheme

2023 AQA GCSE COMBINE D SCIENCE: TRILOGY 8464/B/1 H Biology Paper 1H Mark scheme

AQA GCSE BIOLOGY 8461/2H Paper 2 Higher Tier *236G84612H/MS* Version: 1.0 Final *jun2384612H01* IB/M/Jun23/E21 8461/2H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Friday 9 June 2023 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. ...

3 © OCR 2023 Turn over "The larger the animal, the more chromosomes it has in each body cell." 1 (a) Write these structures in order of size. Cell Chromosome Gene Nucleotide Nucleus Smallest ..................................... ..................................... ..................................... ..................................... Largest ..................................... [4] (b) The table shows the number of chromosomes that different animals have in each body cell. ...

2 © OCR 2023 ring ring ring 1 Fig. 1.1 shows parts of the human nervous system. Fig. 1.1 Brain Structure B Muscle Spinal cord Structure A (a) Structure A allows us to sense the things we touch. What is the name of structure A? Put a around the correct option. CNS Effector Motor neuron Sensory neuron [1] (b) The muscle contracts to move the arm when it receives a nerve impulse from the brain. What type of structure is the muscle? Put a around the correct option. CNS Effector M...

AQA GCSE Biology B3 What is Osmosis? It is the diffusion of water through a semi (partially) permeable membrane. the movement of water molecules from an area of high concentration to low. What are Isotonic drinks (sports drinks)? Isotonic drink are drinks that contains a similar level of sugar, ions and water of that of human body. The sugar replaces the amount of sugar released during exercise, and the water and ions replaces the water and ions that are lost via sweating. What two w...

2 © OCR 2023 1 (a) (i) Complete the table to compare cellular aerobic and anaerobic respiration in humans. Tick () the correct boxes in each row. [3] (ii) Which statement about respiration is correct? Tick () one box. Aerobic respiration produces more ATP than anaerobic respiration. Anaerobic respiration produces more ATP than aerobic respiration. Both aerobic and anaerobic respiration produce the same amount of ATP. Neither aerobic or anaerobic respiration produces ATP. [1] (b) H...

AQA GCSE Biology Bioenergetics what are the products of photosynthesis ? oxygen and glucose how does water enter a plant ? roor hair cells Brainpower Read More What is an endothermic reaction? A reaction that takes in energy from the surroundings what are uses for glucose in plants ? - for respiration - to make starch - to make cellulose In the required practical to investigate how light intensity affects photosynthesis, what would you expect to happen as the distance betwe...

2 © OCR 2023 ring ring ring 1 Fig. 1.1 shows parts of the human nervous system. Fig. 1.1 Brain Structure B Muscle Spinal cord Structure A (a) Structure A allows us to sense the things we touch. What is the name of structure A? Put a around the correct option. CNS Effector Motor neuron Sensory neuron [1] (b) The muscle contracts to move the arm when it receives a nerve impulse from the brain. What type of structure is the muscle? Put a around the correct option. CNS Effector M...